Self-healing material.



No. 707,550. Patented Aug. 26, i902.

G. H.`CHINNOCK.

SELF HEALING MATERIAL.

l (Application led Apr. 24, 1898.)

(Nn Model.)

my Hamm palms co, PHOTLLLITMQ.. wAsmNuTon. n. c.

UNTTED STATES PATENT OFFICE.

GEORGE II. CIIINNOCK, OF BROOKLYN, NEW YORK, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, TO J. J. NICHOLS AND H. II. JANDORF, OF NEW YORK, N.Y., ANDS. S. RYCKMAN, OF GRIMSBY, ONTARIO, CANADA.

SELF-HEALING MATERIAL.

SPECIFICATION forming part of Letters Patent No. 707,550, dated August26, 1902. Application tied Api-i124, 189e. sei-n1 No. 588.869. (Nospecimens.)

To all whom, it may concern:

Be it known that I, GEORGE Il. CHiNNooK, a citizen of the United States,residing in the city of Brooklyn, county of Kings, and State of NewYork, have invented a new and useful Self-Healing Material, of which thefollowing is a specification, reference being had to the accompanyingdrawing, forming a part of the same, wherein for convenience I have toadapted my invention to an ordinary hosepipe tire, ct and I)representing layers of rubber held together by the usual layer of thinfabric and cement. For convenience I have separated the inner layer fromthe fabric to form a pocket for the tube c, containing the self-healin gmaterial d. The illustration represents a section of a tire wheniniiated.

Heretofore in compounds used in connection with pneumatic tires toinsure self-healzo ing properties great difficulty has been experiencedowing to atmospheric changes and also to the fact that after a time thecompound would harden, stripping it of its function and at the same timedetracting from z5 the elasticity of the tire itself.

The object of my invention is to eliminate the difficulties hereinbeforeset forth and to produce a lasting compound operative under allatmospheric changes. I have found that 3o a basis of vegetable gums withsuitable material to give the same body and an addition of oils whenused in suitable proportions will produce such a compound.

To more particularly describe the various changes in my compound, IWould say that gum-caoutchouc remains the only fixed vegetable gum, andunder certain circumstances I employ any suitable resingpsugum,asphaltum, tar, or camphor-gum. As oils Iemploy 4o the fatty oils, thecarbon oils, and the volatile oils, such as naphtha, benzin, or ether. J

To practically apply my compound to a pneumatic tire, I would employgum-caoutchouc, a resinous gum, Wax, sulfur, and one of "the volatileoils, grind until thoroughly mixed, hermetically seal in a thin layer ofrubber, and vulcanize into the tread of the tire. The action of thecompound here given is peculiar. As soon as a puncture has been made ina tire and the instrument of punc- 5o ture removed the compressed aircoming in contact with the walls of the puncture hardens said walls bythe evaporation of the volatile oil and forms a plug that is forced intothe outer tread portion, and a hardened plug is formed over the innermouth of the puncture, completely sealing the tire. For mackintoshes,hot- Water bags, and rubber boots or similar articles I wouldhermetically seal a layer of a compound consisting of gum- 6ocaoutchouc, Wax, a fatty oil, and a volatile oil ground and mixed.

The proportions preferred in the pneumatictire compound and found tooperate practically under all conditions are: gum-caoutchouc, seventyper cent.; resinous gum, ten per cent.; Wax, nine per cent.; sulfur, oneper cent.; volatile oil, ten per cent.

The compound as adapted to mackintoshcs,

rubber boots, hot-Water bags, and the like op- 7o crates in a mannersimilar to the compound relating to pneumatic tires; but the proportionsof all the ingredients except the first would be changed owing to thefact that only atmospheric pressure is available.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is y A composition of matter, consisting of a pasty massof gumcaoutchouc, Wax, resinous 8o gums and volatile oils in suitableproportions, hermetically sealedbetween layers of rubber and insertedwithinthewalls of the article in which it is to be used, insubstantially the manner set forth.

GEORGE II. CIIINNOCK.

Witnesses:

FREDERIC J. PECK, Y FRANK L. ZAnnIsKIE.

